Drill-chuck.



No. 709,0]4. Patented Sept. l6, I902. A. l. JACOBS.

DRILL CHUCK.

(Application filed May 10, 1902.)

'No lvl odel n n H!!! 3 UNITED STATES PATENT OFFICE.

ARTHUR I. JACOBS, OF HARTFORD, CONNECTICUT.

DRILL-CHUCK.

SPECIFICATION formingpart of Letters Patent No. 709,014; dated September16,1902. Application iilecl May 10,1902. b'erialllo.106,'722. (Nomodel.)

To (all whom it may concern? .Be it known that I, ARTHUR I. JAcoBs,a

t citizen of the United States, residing at Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Drill-Chucks, of

which the following is:a specification. This invention relates to achuck which has. Jaws that are movable in recesses inclined to theaxisof the body forgripping and releasing the shank of adrill or similartool.

The object of this invention is to construct a strong chuck of thisnature with simple,

cheap, and convenient means for opening and closing the tool-holdingjaws.

The body of the chuck that is illustrated a embodying the invention hasradial sockets or pins forthereceptionof the end of a key and rack-teethon an edge of the nut-sleeve for engagement with gear-teeth on thekey,so

that when theend of the key is applied to the body and turned themeshing of the gear- "teeth and the rack-teeth turn the nut and causethedesired movement of the jaws.

Figure 1 of the accompanying drawings shows a side view of the improvedchuck with akey in position for turning the nut sleeve. Fig. 2 shows acentral longitudinal section of the chuck'with the key removed. Fig. 3shows a view of the end of the chuck with the key in position for use,and Fig. 4: shows a section of a portion of the chuck arranged for amodified form of key.

The body 5 of the chuck has the usual taperingsocket b for the receptionof the shank by means of which the chuck is attached to the spindle of adrill-press or lathe. The jaws 7, of which there are three, are

arranged in the inclined recesses 8 and are adapted to be movedobliquely toward and from the axis of the body by the engagement of thethreads on the. interior of the nut 9 with the threads on their outeredges. The sectional nut is loosely held in an annular recess 10 in thebody and is fastened to the sleeves 11 by pins 12 or otherwise. The edgeof the nut-sleeve is cut,soas-to provide rackteeth 13, and radialsockets let are. made in the body of the chuck adjacent to the serratededge of the sleeve.

The first key that is shown is formedof a 'inent.

spindle 15, having a handle 16 and agear 17. Then the end 18 of this keyis inserted into asocket 14, the teeth of the gear will mesh with therack-teeth on the edge of the sleeve, and when the key thus placed isturned the meshing of the teeth imparts a r0taryjn1ovement to the sleeveand nut and causesthe de sired opening or closing of the tool-holdingaws. 7

As shown in Fig. 4, instead of formiugkeysockets in thebody pins 19 maybe driven into the body so as to project radially, and the end of thekey or the gear 20 on the end of the key maybe recessed to fit onto thepins.

and-without the necessity of holding the body of the chuck ordrill-spindle against move- This effects a saving of time, for a spannermust be applied to the sleeve on one side for turning in one directionand then reversed for turning the sleeve in the opposite direction, andit frees one hand, for the rea son that the body of 'the chuck is heldand the sleeve given a rotative movement with relation to the body bythe engagement of t the key with the body of the chuck and the meshingof the gear-teeth with the rack-teeth on the edge of the sleeve.

, The construction is simple and the action is convenient andetifective.

I claim as my invention-- 1. A drill-chuck having a body with an annularoutwardly-opening nut-recess and axially-inclined jaw'recesses, jawsmovable in the jaw-recesses and having exterior threads,

' a nut movable in the nut-recess and having interior threads engagingthe threads on the jaws, a sleeve encircling the body, attached to thenut and having on its edge teeth that are adapted to be engaged by atoothed key, substantially as specified.

2. A drill-chuck having a body with an annular outwardly-openingnut-recess and axially-inclined jaw-recesses, jaws movable in thejaw-recesses and having exterior threads, a nut formed in sections,movable in the nut- -recess and having interior threads engaging thethreads on the jaws, a sleeve encircling the body, attached to thenut-sections and too l0 ing the threads on the jaws, a Sleeve encirclingthe body outside of the nut-recess, attached t0 the nut and having teethon its edge, and a key-recess in the body back of the sleeve adapted toreceive a toothed key, substantially as specified.

ARTHUR I. JACOBS.

Witnessesi H. R. WILLIAMS, V. R. HOLCOMB.

